With the 3.7.5 release, hardware-based FIPS cryptographic modules were replaced with software-based. Therefore, special instructions are necessary if you are upgrading to version 3.7.5+ from a pre-3.7.5 release.
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Within your HMG/HSG web interface, toggle the FIPS button to OFF in the Administration > System Settings > Security screen.
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Upgrade to 3.7.5 as normal as described in (3.8.1) Installing an Update Package.
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Enable the software-based FIPS modules as described in (3.8.1) Enabling/Disabling FIPS Cryptographic Modules.